vm2: vm.freeze()/vm.readonly() bypass via accessor descriptor

Summary Untrusted JavaScript running inside new VM.run / new NodeVM.run can bypass vm.freeze / vm.readonly and mutate a host object the embedder explicitly marked read-only - the documented contract is "prevent sandboxed scripts from adding, changing, or deleting properties". If the frozen host...

Modification of Assumed-Immutable Data (MAID)

Overview vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules. Affected versions of this package are vulnerable to Modification of Assumed-Immutable Data MAID in the Object.getOwnPropertyDescriptor or lookupSetter process. An attacker can modify properties that we...

CVE-2026-92949 vm2 3.9.6 before 3.11.7 Sandbox Bypass via Accessor Descriptor

vm2 versions from 3.9.6 before 3.11.7 fail to properly restrict access to accessor properties on frozen objects, allowing sandboxed scripts to bypass vm.freeze and vm.readonly protections. Attackers can use Object.getOwnPropertyDescriptor or lookupSetter to extract and invoke host object setters...

CVE-2026-92949: Modification of Assumed-Immutable Data (MAID)

vm2 versions from 3.9.6 before 3.11.7 fail to properly restrict access to accessor properties on frozen objects, allowing sandboxed scripts to bypass vm.freeze and vm.readonly protections. Attackers can use Object.getOwnPropertyDescriptor or lookupSetter to extract and invoke host object setters...